Cleaning device and process for waste polyester bottle chip

Abstract

The invention provides a cleaning device and process for a waste polyester bottle chip. The cleaning device is characterized in that a plurality of re-distributors are fixedly arranged in the device body from the top down at intervals; a rotating shaft is rotationally fixed at the bottom of the body and penetrates the openings of all the re-distributors ; the upper end of the rotating shaft is in transmission connection with a power device; stirring blades are arranged on the rotating shaft; a plurality of through holes are formed in each re-distributor; the bottom of the body is communicated with an ethylene-glycol steam pipeline, and the internal temperature of the body is reduced from 240 DEG C to 90 DEG C from the top down. According to the invention, ethylene-glycol cleaning agent can not corrode equipment; meanwhile, the temperature at the top is higher than that at the lower part; so that not only the cleaning is clean, but also the chip dropping speed is controllable, and the alcoholysis reaction is easy to control. Besides, the soiling solution generated is small, and the recycle cost is low.

Description

Technical field [0001] The invention belongs to the field of recycling and utilization of polymer plastic materials, in particular to a cleaning device and a cleaning process for waste polyester bottle flakes. Background technique [0002] The recycling of polyester bottles is a very important part of the technical field of polymer plastic materials recycling. The recycling of polyester bottles mainly includes the pre-cleaning stage and the subsequent recycling treatment stage. [0003] In the cleaning stage, the prior art mostly cleans the oil stains, paint and other oil stains on the surface of the polyester bottle flakes through the cooking alkali tank. There are many shortcomings: 1) The solvent is corrosive, and the equipment body of the cooking machine is seriously damaged; 2) The lye used for cleaning operations is not easy to be recycled and can only be discharged into the sewage tank, which not only causes a waste of resources, but also seriously pollutes the environment....

AI Technical Summary

Problems solved by technology

[0003] In the cleaning stage, the prior art mostly removes oil stains, paints and other oil stains on the surface of polyester bottle flakes through a cooking soda pool, which has many disadvantages: 1) The solvent is highly corrosive and seriously damages the equipment body of the cooking machine; 2) The lye used for cleaning operations is not easy to recycle and can only be discharged into the sewage tank, which not only causes waste of resources, but also seriously pollutes the environment

Recently, some "bottle" to "bottle" technologies and "bottle" to "fiber" technologies have been developed, but these "bottle" to "bottle" and "bottle" to "fiber" technologies use ethylene glycol for alcohol During the hydrolysis reaction, since the melting point of polyester bottle flakes is 270°C, the temperature of the alcoholysis reactor is generally about 270°C, and the remaining ethylene glycol vapor (the boiling point of ethylene glycol is 197.3°C) is recovered and reused , it needs to be reheated to raise the temperature, and the energy is wasted a lot. Moreover, the cleaning agent used in the cleaning stage is different from the reactant used in the recycling stage, which makes the entire cleaning and recycling process cumbersome and complex in the structural design of the equipment.

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